Some students even have no idea of　　　they are studying, so they are aimless most of the time.
A．whoB．when
C．whereD．why
選D�？疾橘e語從句。句意: 一些學(xué)生甚至不知道他們?yōu)槭裁磳W(xué)習(xí), 所以他們大部分時(shí)間漫無目的。根據(jù)語境aimless推知“不知道學(xué)習(xí)的原因”, 故答案D合適。
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